Midterm Review MC (Units 1-3)

What is the formula of disulfur octachloride?

• S₂Cl₈

• SCl

• S₃Cl₇

• S₂Cl₆

Choose the option below where the types of electromagnetic light are ranked from the lowest frequency to the highest frequency:

• microwaves, blue light, x rays, gamma rays 

• ultraviolet, infrared, x rays, gamma rays

• radio waves, x rays, green light, red light

• x rays, infrared, microwaves, radio waves

How would you write the formula of hydrobromic acid? 

• HBrO₄

• HBr

• H₂Br

• HBrO₃

Light is emitted when electrons

• move from a lower energy level to a higher energy level

• collide with one another, releasing energy

• move from one atom to another

• more from a higher energy level to a lower energy level

A certain atom has 20 electrons, 21 neutrons, and 20 protons. What is the atomic mass of the atom? 

• 20

• 41

• 61

• 21

What wavelength of light is emitted by an electron as it falls from energy level 5 to 3?

• 1282 nm

• 656 nm

• 1094 nm

• 103 nm

Which block on the periodic table has elements with the highest ionization energies? 

• s

• p

• d

• f

Bismuth-211 is a radioactive isotope that can decay by emission of an beta particle. What atom is the product of beta decay of bismuth-211?

²¹¹₈₃ Bi --> ____ + ⁰_-1 e

• ²⁰⁷₇₉ Au

• ²¹¹₈₄ Po

• ²¹⁵₈₅ At

• ²¹¹₈₂ Pb

What is the chemical formula of cobalt (II) hydroxide?

• CoOH

• Co(OH)

• CoOH₂

• Co(OH)₂

Citrus fruits are known for being sour because of the presence of citric acid within them. Based on the name of this acid, what is the most likely name of the ion it is made of?

• hydrocitric ion

• citride ion

• citrious ion

• citrate ion